const nodemailer = require('nodemailer');
const env = require('../../config/env');

let transporter;

const getTransporter = () => {
  if (transporter) return transporter;

  if (env.mail.user && env.mail.pass) {
    transporter = nodemailer.createTransport({
      host: env.mail.host,
      port: env.mail.port,
      secure: env.mail.secure,
      auth: {
        user: env.mail.user,
        pass: env.mail.pass,
      },
      tls: {
        rejectUnauthorized: env.mail.rejectUnauthorized,
      },
    });
    return transporter;
  }

  transporter = nodemailer.createTransport({
    streamTransport: true,
    newline: 'unix',
    buffer: true,
  });

  return transporter;
};

const sendMail = async ({ to, subject, html, text, attachments }) => {
  const activeTransporter = getTransporter();
  const from = env.mail.from.includes('<')
    ? env.mail.from
    : `LinkedSign <${env.mail.from}>`;
  const info = await activeTransporter.sendMail({
    from,
    replyTo: env.mail.from,
    to,
    subject,
    html,
    text,
    attachments,
  });

  return info;
};

module.exports = {
  sendMail,
};